It's graduation season! And at my graduation we threw tortillas, beach-balls and toilet paper- but NO ONE threw punches!
Pay attention to the student right when he walks out from behind the curtain.
Not only does he have an escort with him (red flag) but he attacks one of the first teachers he encounters. Then as he nears the end of the procession line- he throws a sucker punch at (what appears to be) a female teacher!
There is a possibility that this was a special needs student as it appears none of the teachers were surprised.